Sylvania



. Reg. 15,623

June 12, 1923. R. E. HELLMUND EXCITING SYSTEM FOR PHASE CONVERTERS Original Filed Aug. 7,

onennnnuuonnnn /////Ill/II/II/MIIIIII/II/b.

INVENTOR fiudolf f. lie/Imam! wmuasss:

ATTORNEY 1 "I and" State of Pennsylvania,-

" 25 or balancing therein.

.40 to the Reiaued June 12, 1923.

UNITED STATES 1 Re. l5,623

PATENT OFFICE,

B'UIJOLF E. HELLKUND, OF SWISSVALE, PENNSYLVANIA, ASSIGNOR TO wns'rmm HOUSE ELECTRIC AND MANUFACTURING COMPANY, A CORPORATION OF PENN- SYLVANIA.

Original no. 1,2s1,a55,

To all whom it may concern: Be it known that I, RUnoLr E. HELL- IUND, a citizen of Germany, and a resident of Swissvale, in the county1 of Allegheny ave invented a new and a useful Improvement in Exciting Systems for Phase Converters, following is a specification.

My invention relates to, exciting systems for phase-converters, particularly of the T- connected, rotary type, and it has for its object to provide systems of the character designated wherein double-frequency electromotive forces for urging the working cur- 1 rent through the rotor circuits of said baseconverter may be produced in a simp e and efiective manner.

Another object of my invention is to provide means, in a system of the character designated, whereby a unidirectional electromotive force may also be produced for supplying direct exciting current to the rotor windings of said phase converter for syn 'chronous operation and phase. compensation In the accompanying drawing, Fig. 1 is a diagrammatic view of a phase-converter provided with certain coordinating elements, to-

ther constituting a system embodying my invention; Fig. 2 1S adiagrammatic view of i a modification of the system shown in Fig, 1, and.Fig. 3 is a fragmentary view, partially in section and partially in elevation, o

the system of Fig. .2.

application, Serial .No. 108,567, fil July 11, 1916, I have disclosed. and claimed means whereby double-irequency exciting currents may be supplied as ployed in '1 In my cgxpending urging the working currents the particular exciting machines employed being of the commutator type. By supplying exciting currents of the character desig- Lg ated, the dropsin the various portions of the phase-converter may be compensated for the phase-converter may be givencom- 'unding characteristics of any desired orm. m" In ny copending application Serial No. a 113,454, filed Au st 1916, i have disclosed and "claime of which the f I winding a composite dynamo-electric machine mg star-connected rotor winding rotor winding of a phase-converter for therethrough a systems similar to those nxorrmo srsrnn ron rmsn convnnrnns.

just mentioned-but, in addition, means are provided for supplying unidirectional exciting current to the rotor windin .of the phase-converter in order to cause iesame to operate in synchronism so that phase compensation or balancing may be efi'ected,

By the resent invention, I provide systems of t a general character above described but the auxiliary exciting machine employed is .of the induction type, thus doing away with commutation ifiiculties.

. By causing the rotor of the exciter machine to rotate in the same direction and at the 5 same speed as the rotor of the phase converter and b supplying the stator winding of the auxi iary exciter with alternating current from the terminals of the phase-converter, the connections being such that the resultant rotating field in the stator of said auxiliary exciter rotates in the opposite direction from the rotor thereof, there are pro duced in the rotor winding of the exciter machine double-frequenc currents suitable for the compounding of the main phase-converter. I i I Other details of my inventionwill hereinafter more fully appear.

Referring to Fig. 1 for a more detailed understanding of my invention, I show a phase-converter ot the T-connected rotary type at 4, said phase-converter having a primary stator winding 5, a secondary stator 6 and a rotor 7 provided with a 8. 'The outer terminals of the rotor 8. are connected, .respectively, to suitable slip rings 9 for connection to external circuits.

An auxiliar machine 10, of the induction type, is provi ed for excitingpurpos'es an comprises a stator member 11 and a rotor member 12. The statorwinding 11 is phase wound and the magnetic axes o the-various poles 14-14 thereof may be adjusted'.c1r-' cumferentially by any suitable means as, for v example. by mechanical movement thereot through suitable handles 13 or by forming a distributed windin on the stator member and adjusting the points of connection there'- of, as shown inPatent-No. 1,186,818, issued to theWestinghouseElectric & Manufacturin Company on June 13, 1916, on an ap plication filed by F. W. Meyer.

j 45 No, 113,456,

" 9- com 'ensatiorgggs, described in detail 1 v j"- The rotor member of the auxiliary exciter the load '17, the relative connections being such that the rotatin field established in the statormember of the 'exciter machine rotates in the o'ppositedirection from the rotor thereof." A double-frequency electromotive force is accordin ly generated in the rotor phase winding 1 of the exciter machine which is supplied to the rotor winding of the machine 4 through the usual slip rings and brushes. I

It i s frequently desirable to eliminate even slip rlngs, as their use necessitates frequent ervision for brush adjustment and lubrication. This result may be attained by forming the rotor member a converterandof the exciter integral structure, as indicated at 20 in Fig. 2. h

g left-hand or major portion of the in composite structure 20, corresponding to the rotor member 7 of the phase-converter 4 in Ffg l, is subject to the influence of the stator.

primary and secondary windings 5' and 6, whereas the ri -ht-hand or minor portion 12 of the composite structure 20 is subject to the' lnfluenceof the phase windings 14 14. e winding of 'thecomposite structure may now take the form of a sduirrel-cage, as indlcated n my copendingapplication, Serial filed August 7 1916, and under; these conditions, ifthe direction of rotation of the rotating field of the windings 1414 is as previously described, suitable doublefrequency currents are generated in the minor portion 12 of the composite structure 20 andare 'caused to circulate through the I a or portion 7 thereof to produce the dcslredcomp'ounding.

i v '0 major portion '1 of the composite structure 20 may be provided, in addition. wi th a phase winding 21 and direct-current exgitation, may be suppliedthereto from any "suitabldsource, as indicated at 22, for synroams operation and for power-factor in my August ial No.. 113,454, filed Themanner in the various windings of the composite machine of Fig. 2 are mounted and disposed is indicated in Fi e. operation of the phase- 3 wherein the field frame is shown at 23 as supporting inwardly-projecting field-core members 24 and 25. The member 24 carries the stator windings 5 and 6 and,.in like manner, the field member 25 carries the winding 14:-14. The shaft of the machine is indicated at 26 and carries rotor core members 27 and 28 in alinement, respectively, with the field members 24 and 25. The squirrelcage winding is shown at 29 and extends across the face of both rotor core members. The rotor core member 27 is provided, in addition, with the winding 21, as indicated in Fig. 2.

While I have shown my invention in a plurality of forms it will be obvious to those skilled in the art that it is susceptible of various" minor changes and modifications without departing and I desire, therefore, that only such'limitations shall be placed thereupon as are imposed by the prior art or as are set forth in the a pended claims.

I c laim as my invention:

1. The combination including a polyphase system having balanced conditions, a dissimilar alternating-current system, an

induction machine aggregate, comprisingmain and auxiliary polyphase primary windings and secondary windings, said secondary windings including a plurality of circuits each of which is subjected to the influence of the flux produced by both said. main and auxiliary primary windin s, means for connecting said balanced pol yphase system in forward phasesequence to said main pri- [nary windings, means for connecting said dissimilar system tosaid main primary windings for interchange of power with said balanced polyphase system, and means for energizing said auxiliary primary windings in reverse phase sequence whereby substantially balanced conditions may be maintained in said balanced polyphase system. 2. In the combination including a polyphase system having balanced conditions, a dissimilar alternating-current system, an induction machine aggregate, comprising main and auxiliary polyphase primary windings and secondary windings, said secondary windingsincluding a plurality of circuits, each of which is subjected to the influence of the flux produced by both said main and auxiliary primary windin means for connecting said balanced 'pol phase system in forward phase sequence to said main rimary windings, means for con necting said dissimilar system to said main primary windings for with said balanced polyphase system, and means for energizing said auxiliary primary windings in reverse phase sequence, the step in the method of maintaining substantially balanced conditions in said balanced polyphase system, which consists in varying the from the spirit thereof interchange of power l .mgsim-acoordam withhe.- p wsr in 3i ,emmbination i c ud ng pew-Phas haying conditions, adis similar alternating-current system, an in- I duetim' vmachine "aggregate, comprising main and auxiliary polyphasef pr mary mild-lugs nndl'seeolidalzy win 'wind me x mludin ;dwcmt$' whofi .fluen which is an jected to the in- 1 for a phase- System in" forward phase sequence to said main p'ri I windings,- means for cdnnectipg},'saldjsfiisslmiiarsystem to said main primary windings for-inter ange of; a a as w h; said; bemused po yghasa y m, meter energizing sal 'aamliary pm ry windings phase sequence, and

or varying-theirelative angular -posi- 0518331 reverse phase-sequence excitations may bmmaintained poly phauesystm i in said "balanced oad'auiriiiary polyph se p i-- pmn' any 5i i i i g ;w1n n ec iyey dn orwar and backward pb sefi ogationjineans for ad the relative, angular positions of the pr ducadrbyu said primarydsec'ondarywindin 'lhfilildlng phi: 1tyci euits'ea h of with is suh ected tothe influence of the flux produced 2: Midi main rand auxiliary primary ivwlndings, said energizing means being operable to maintain predetermined voltage conditions in said main primary windings.

5, A phase balancer comprising a synchronous dynamo-electric machine having one of itspoly'phase windings adapted for connection to a polyphase distributing system, a. second lyphase winding in inductive relation th dreto, and means for introducing polyphase :currents into said secondary windin for the purpose of maintaining I r polyphase conditions in said first winding. 5

. phase; ynamo-electric. machine having a rs a main -polyphase winding on one of said members adapted for connection to a polyphase distributing system, a polyphase .fllfixclting winding onthe other of said mem- '.bers, and means for s11 erposing upon the excitation .of sand exciting winding substantially double-synchronous frequency,

inuntaining balanced polyphase conditions in said main winding. 1 I 7. The combination including main and auxiliary induction machines having their as said antr was.

dings, said sec a, plurality ofthe; flax: by both said d 1 auxiliai'gy" pdmary: "y rindings o co necting saidfbalanced-poiy tibn; whereby substantially balsnced condi- Ii. aggregate, coin 3111888 balancer comprising a polyo if of, relatively rotatable magnetic mem magneto-motive forces "for the purpose of I of said secondaries rotating respectively. in forward and backwardv directions and at correspond ing speeds with respect to their respective prlmariesgand connectionsbetween the seconda', windings-ofthe two machines.

8 'Fhe combination with a polyphase system subject to unbalancing condltions, of a phase-balancerofthe rotary" type connected thereto, an auxiliary dynamo-electric ma chine having. polyphase purimary windings and relative] (I rotating secondarywindings,

meanswhere y said primary windings. are connected to said system so as to. produce a field rotating backwardly with respect to its, secondary windings, and connections be tween the machines.

secondary windings' of the two 9. The-.combination witha polyphase sys tem subject to unbalancing conditions, of a phase-lla-lancer "of the rotor type connected thereto, an' auxiliaryv dynamo-dectrio machine having polyphase primary windingsandlrelatively-rotating secondary windings, .moans wherebyfsaid primary windiitiigs are contracted to said system so as to pro 'uce a; field rotatingibackwardly with respect to -its secondary windings, and con;

nections between the secondary windings of a the two machines, the secondary v windings of the two machines rotating at c orrespond' ing speeds withrespect to their prlmary windi tion machine, of an auxiliary induction ma chine mechanically associated therewith,

10. %e mamas with-fa main induc-o means for energizing the pri rnary windings I ozbsaid malnsmdauxiharyfmaehines re 7 spectivelyf in forward and backward phase I rotation; and connections between the seconda windings of the two machines.

11. ecombination with an alternatingcurrent system, of a phase-converter of the rotary type having its primary winding connected thereto, a substantially jtwo-toone frequency converter, and connections 'for inserting said frequency converter between said system andthe secondary wind-' ing of said phase-converter, whereby said] secondary windin is su lied with excitv 2' Pl 5 ing current ofsubstantial o y twice the fre- 1 3 0f Sald s stem.

12. The combination with a source of'all ternatin'g current, ofa phase-converter of the rotary type connected thereto, an auxili ary dynamo-electric machineprovided with a phase-wound primary and having; its

rotor mechanically coupled to the rotor of a said phase-converter, the rotating primary field of said auxiliary machine rotates in the o posite direction, with respect to the directlonof rotation of the rotor, from the rotating primary field phase-converter, and connections between te secondary windings of the two machines.

connections whereby 3' 1 13: The coihhihation with a souree ofah terfiatiflgbtififefitgofj'a hase converter of the t; having its rimer-y wind- 4- g (term I heretojanjanxiliary dynamo electridmachine ofi'the induction type, me 'lchanical emiplingmeansbetween the rotors of the H6 machines, electrical connections the se'ediitfary windings of the two maehines; "and' saeh connections from "the! output terminalf'bf the phase-converter i tllrou giftfthe primary winding of said auxil: fiery-machine that the rotatingffield thereof rd in the opposite'dire'ctlon fromth at whieh lghgfirofer' of said auxiliary ma eeombitation with a: source om ternating; cari'ent, of a hase oonVerter of e type havi'ng ts 'prim'ary windlkfi'eofin'ected thereto, an "auxiliary dynamo- I eleetriefiachifie of the induction type, meehmiea'l couplifig' m'eans'between the rotors electrical "connections weeh secondary windings of the two 1 y lies, connections from the" output T26 termtinlllflhof the ph k the p "f erywindin of; said auxiliary-ma- 1 .ehim manna rotating field the'reof rotates in theopfiosite direction from that'in 'whioh wee-con?erter through of thi exfitifig currentsfsu pliedby said auxiI'in'a'y machine to said 1) ase conyei'ter. 1 IfiUThWcOmbinatiOn with a source'of alhaving 118 primer. windreto,-anaax1liary 'ynamolnn'e' of theindnction type, me

the 'of" 5,iid'" auxiliary machine is' amen, immune for 'adjiisting the phase of a Phase-converter of mesa chanieal' couplin nieana between therotdrs of the two ma inis, electrical "connections between the secondaries of the two. ma-

chines, such "connections from therloutput terminals of the phase-converter through the primary winding'of saidauxiliar-y ma- 7 chine that the. rotating field thereof rotates in the opposite direction from that in which the rotor of said auxiliary machine is driven and means. for moving the 10- cation of the ntlagnetic axes of the poles'of the rimary, of said auxiliary machine oircum erentially relatively to the secondary winding, whereby the ing currents furnishe thereby to said phase-converter may be adjusted.

I6. The'combina'tion with a source of alternating current, of a phase-converter of base of the excit the rota 'typehaving its primary winding connecte electric machine of the induetiontype, me

-. chanical coupling means between the rotors:

of thetwo machines, electrical connections between the secondary windings of the two machines, such connections from the out-' put terminals I oi the phase-converter through the primarywindin of said auxiliariy machine that the rotating field there of rotates ini'the opposite direction from that in -which;the rotor of said auxiliary machine is drivem and additional means for supplying unidiretionalrurrent {to th 70 In testimony whereof, I have herennto .f

subscribed my namethis} 23rd day of 'Decamber, 1919. i

secondary of said phase-converter.

RUDOLF E;

thereto; an auxiliary dynamo 

